Springmvc 文件上传

1 Springmvc 文件上传

1.1 配置解析器

    <!-- 配置文件上传解析器 -->
    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 设定默认编码 -->
        <property name="defaultEncoding" value="UTF-8"></property>
        <!-- 设定文件上传的最大值5MB，5*1024*1024 -->
        <property name="maxUploadSize" value="5242880"></property>
    </bean>

1.2 所需jar包

CommonsMultipartResolver解析器依赖commons-fileupload和commons-io，加入如下jar包：

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.2.2</version>
</dependency>
<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

1.3 单个图片上传

@Controller
public class PictureController {

    @Value("${IMAGE_SERVER_URL}")
    private String IMAGE_SERVER_URL;

    @RequestMapping("/pic/upload")
    @ResponseBody
    public String picUpload(MultipartFile uploadFile) {
        try {
            //接收上传的文件
            //取扩展名
            String originalFilename = uploadFile.getOriginalFilename();
            String extName = originalFilename.substring(originalFilename.lastIndexOf(".") + 1);
            //上传到图片服务器
            FastDFSClient fastDFSClient = new FastDFSClient("classpath:resource/client.conf");
            String url = fastDFSClient.uploadFile(uploadFile.getBytes(), extName);
            url = IMAGE_SERVER_URL + url;
            //响应上传图片的url
            Map result = new HashMap<>();
            result.put("error", 0);
            result.put("url", url);
            return JsonUtils.objectToJson(result);
        } catch (Exception e) {
            e.printStackTrace();
            Map result = new HashMap<>();
            result.put("error", 1);
            result.put("message", "图片上传失败");
            return JsonUtils.objectToJson(result);
        }

    }
}

页面：

form添加enctype=”multipart/form-data”：

form id="itemForm"
        action="${pageContext.request.contextPath }/item/editItemSubmit.action"
        method="post" enctype="multipart/form-data">
        <input type="hidden" name="pic" value="${item.pic }" />